Folding grindstone-frame.



No. 887,865. PATENTED MAY 19,1908. D. I. STERLING.

FOLDING GRINDSTONB FRAME.

APPLICATION FILED DEC. 26, 1907- 4 SHEETS-SHEET 1.

luv 6 72 607 I Win60 ma -(2,43%

No. 887,865. PATENTED MAY 19, 1908. n. I. STERLING. FOLDING GRINDSTONE FRAME.

APPLICATION FILED DEC. 26. 1907.

4 SHEETS-SHEET 2.

No. 887,865. PATENTED-MAY 19, 1908. D.I.STERLING.

FOLDING GRINDSTONE FRAME. APPLICATION FILED DEC. 26, 1907.

Wi'fneo'd'e \s" 07? pow! 37W THE NORRIS PETERS ca, WASHINGTON, 0. c4

4 sums-$311M s.

No. 887,865. PATENTED MAY 19, 1908.

D. I. STERLING.

FOLDING GRINDSTONE FRAME.

APPLICATION FILED DEG. 26, 1907.

4 SHEETS-SHEET 4.

m't I L206 71607! rm: uomus psrsns cm. wAsnmciaN. D. c.

UNITED STATES PATENT OFFICE.

DAVID I. STERLING, OF BEREA, OHIO, ASSIGNOR TO THE CLEVELAND STONE COMPANY, OF CLEVELAND, OHIO, AN OHIO CORPORATION.

' FOLDING GRINDSTONE-FRAME.

Specification of Letters Patent.

Patented May 19, 1908. I

Application filed December 26, 1907. Serial No. 408,162.

T 0 all whom it may concern:

Be it known that I, DAVID I. STERLING, a citizen of the United States, residing at Berea, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Folding Grindstone- Frames, of which the following is a full, clear, and exact description.

The object of the invention is to provide a cheap and strong frame adapted, particularly, for supporting a grindstone and its driving mechanism, and also adapted to be folded so as to occupy relatively small space for convenience in shipment.

The invention is shown in the drawing wherein Figure 1 is a side elevation; Fig. 2 is an end elevation thereof; Fig. 3 is a side elevation of the grindstone and one of its supporting bearing plates,the grindstone arbor being shown in section; Fig. 4 is a sectional view in the plane indicated by line 4, on Fig. 1, through one of the hinges connecting the two legs on one side of the frame; and Fig. 5 is a plan view of the grindstone frame when folded and ready for shipment.

On each side of the frame are two legs A and B, whose upper ends are hinged together by means of hinges which are provided with shoulders adapted to engage with each other, when the said legs have been swung apart as far as desirable, so as to prevent further movement in that direction. Two members of each hinge are indicated by a and b. The hinge members include respectively the flat plates (1, b, which lie against each other, and are pivoted by a suitable bolt pintle a Above the hinge pintle these plates are thickened so as to form shoulders a 6 which will engage with each other, as shown in Fig. 1, when the legs A and B have been swung apart into the position shown in Fig. 1. These hinge lates have below the hinge pintle the socliet pieces a, b, in which the upper ends of the legs A, B are secured. Passing through each of the hinge plates in a plane above the pintle are two bolts a b The arbor c of the grindstone C is rotatably mounted in two bearing plates D. In the lower edge of each bearing plate are the two notches d, which are adapted to embrace the two bolts (1 b and thereby to prevent any movement of the hinge members tending to swing the legs toward each other. These bearing plates are placed each just inside of the associated hinges, and each of the bearing plates is provided with two outwardly projecting lugs d which rest upon the top edges of the two associated hinge members. When these bolts a, b are tightened up, these bearing plates are securely fastened to the hinge members, and prevent any swinging of the legs toward each other. Two skeleton treadles F, F, are pivoted on a long bolt rod extending between and through the two legs B, B. The pitnien E are pivoted to the free ends of these treadles and are provided on their upper ends with hooks e which embrace the crank pin 0 carried by crank arms 0 secured to the ends of the arbor 0 outside of said bearing plates.

For convenience in operating the grindstone, a seat H is secured upon a seat frame G made of bent metal. The two side members g of this frame are perforated at their forward ends and embrace the two bolts 6 ,1), which are employed primarily to fasten the bearing plates D to the hinge members I). The two struts K are pivoted to the legs B, and their upper ends are connected with the side members g of the seat frame by the bolt I. The two legs B are connected by braces M; and the two legs A are connected by similar braces N. It is obvious from the foregoing description that the frame, when unfolded and set up in combination with the grindstone, as described, will be sufficiently rigid and strong for its purpose. In order, however, to fold the parts compactly together, it is necessary, first, to loosen the bolts of, b, and remove the grindstone and its bearing plates D, D. Then the struts K are to be disconnected from the seat frame G. This being done, all of the parts may be folded compactly together into the positions relative to each other, shown in Fig. 5.

Having described my'invention, I claim: 1. In a folding frame, the combination of legs A and B, hinges whose members are secured to the upper ends of said legs and are provided with shoulders which engage and limit the movement of said legs apart, bolts carried by the hinge members and bearing plates having notches which embrace said bolts.

2. In a folding frame, the combination of legs A and B, hinges whose members are seprovided with shoulders which engage and limit the movement of said legs apart, bolts cured to the upper ends of said legs and are p carried by the hinge members, and bearing ends respectively embrace two of the same bolts which secures said bearing plates to said hinges, and struts which are pivoted to plates having notches which embrace said bolts, and having also lugs which rest upon the hinge members.

3. In a folding frame, the combination of legs A, B, hinges whose members are fixed to the upper ends of said legs and are provided l with shoulders which engage and limit the their upper ends with said seat frame. In testimony whereof, I hereunto afliX my signature in the presence of two witnesses. DAVID I. STERLING.

tat

movement of said legs apart, bearing plates, Witnesses: bolts which secure each bearing plate to l P. J. MORRISSEY, both members of a hinge, a seat frame Whose l S. CROOKER.

| two of the legs and are removably connected 15' 

